Apparatus for and method of allocating D-channel to minimum channel when performing basic rate interface service in wireless local loop network system

An apparatus for allocating D-channel to minimum channel when BRI service is performed in WLL system, in BRI interface unit for combining and distributing D-channel in a radio port controller (RPC) of WLL system, said apparatus comprising:

• a channel handler/HDLC controller for extracting D-channel from 2B+D (2 bit+D-channel) data output from a 2W interface, performing a cycle redundancy check (CRC) on the extracted D-channel, and combining D-channel of 2-bits to a single channel of 64 Kbps;
• a CPU for framing data received from said channel handler/HDLC controller to allow an IPC communication and performing a control all over a block;
• a memory connected to said CPU and which stores temporarily variables or data;
• an IPC interface connected between said CPU and a main processor so as to allow an IPC communication;
• and
• a mux/demux unit connected to said main processor and which converts 2-bit data of 64 Kbps input from said 2W interface to data of 2,048 bps.

A method of allocating D-channel to a minimum channel when BRI service is performed in WLL system, in a process of handling D-channel of digital unit included in a radio port (RP) of WLL system, said method comprising the steps of:

• in a bottom-up handling from a terminal to an exchanger, allowing D-channel data to be available for an IPC by CPU of said digital unit and transmitted to a main processor;
• transmitting to a radio port controller (RPC) D-channel which is inserted to channel No. 16 of RPC E1 interface via an IPC interface, together with D-channel data which is inserted in channel No. 16 and LAPD (Link Access Procedure on D-channel) processing data;
• and,
• when D-channel is inserted into B-channel due to a heavy load of channel No. 16, performing LAPD process on said D-channel data together with the data inserted into B-channel, and transmitting the LAPD processed data to said RPC.

A method of allocating D-channel to a minimum channel when BRI service is performed in WLL system, in a process of handling D-channel of BRI interface included in a radio port controller (RPC) of wireless local loop system, said method comprising the steps of:

• in a bottom-up handling from RPC to an exchanger, performing an IPC-process on D-channel data by CPU of BRI interface and transmitting the IPC-processed D-channel data to a main processor;
• transmitting 30-bit data received from said main processor to a mux/demux;
• extracting channel No. 16 from D-channel data input from a radio port, performing high-level data link (HDLC) protocol on the extracted channel No. 16, transmitting the result to CPU, and performing an IPC processing;
• in the absence of D-channel, transmitting by an IPC interface to said main processor an information of absence of D-channel and extracting and processing by said main processor a traffic channel having D-channel;
• in the presence of D-channel, transmitting IPC-processed D-channel and D-channel data to said main processor, transmitting by said main processor D-channel and D-channel data to a BRI interface IPC processor so as to analyze D-channel, and transmitting the result to a high-level data link controller;
• and
• dividing into 2-bit D-channel for each output port by said high-level data link controller, inserting for each channel, and transmitting 2B+D (2 bit+D-channel) data to an exchanger.